diff --git a/components/style/keyframes.rs b/components/style/keyframes.rs
index 884c5fef86b..7c9b969a210 100644
--- a/components/style/keyframes.rs
+++ b/components/style/keyframes.rs
@@ -9,11 +9,11 @@ use parser::{ParserContext, ParserContextExtraData, log_css_error};
 use properties::{Importance, PropertyDeclaration, PropertyDeclarationBlock};
 use properties::PropertyDeclarationParseResult;
 use properties::animated_properties::TransitionProperty;
-use std::fmt;
 use servo_url::ServoUrl;
+use std::fmt;
 use std::sync::Arc;
-use stylesheets::{MemoryHoleReporter, Origin};
 use style_traits::ToCss;
+use stylesheets::{MemoryHoleReporter, Origin};
 
 /// A number from 1 to 100, indicating the percentage of the animation where
 /// this keyframe should run.
diff --git a/tests/wpt/metadata-css/cssom-1_dev/html/interfaces.htm.ini b/tests/wpt/metadata-css/cssom-1_dev/html/interfaces.htm.ini
index aea7989240c..8f0e47d7557 100644
--- a/tests/wpt/metadata-css/cssom-1_dev/html/interfaces.htm.ini
+++ b/tests/wpt/metadata-css/cssom-1_dev/html/interfaces.htm.ini
@@ -183,15 +183,6 @@
   [CSSImportRule interface: attribute styleSheet]
     expected: FAIL
 
-  [CSSGroupingRule interface: attribute cssRules]
-    expected: FAIL
-
-  [CSSGroupingRule interface: operation insertRule(DOMString,unsigned long)]
-    expected: FAIL
-
-  [CSSGroupingRule interface: operation deleteRule(unsigned long)]
-    expected: FAIL
-
   [CSSMediaRule interface: attribute media]
     expected: FAIL
 
@@ -231,12 +222,6 @@
   [CSSMarginRule interface: attribute style]
     expected: FAIL
 
-  [CSSNamespaceRule interface: attribute namespaceURI]
-    expected: FAIL
-
-  [CSSNamespaceRule interface: attribute prefix]
-    expected: FAIL
-
   [CSSStyleDeclaration interface: attribute parentRule]
     expected: FAIL
 
diff --git a/tests/wpt/mozilla/tests/mozilla/interfaces.html b/tests/wpt/mozilla/tests/mozilla/interfaces.html
index debc89bf675..1e09f096618 100644
--- a/tests/wpt/mozilla/tests/mozilla/interfaces.html
+++ b/tests/wpt/mozilla/tests/mozilla/interfaces.html
@@ -22,6 +22,7 @@ test_interfaces([
   "CSS",
   "CSSFontFaceRule",
   "CSSGroupingRule",
+  "CSSKeyframeRule",
   "CSSKeyframesRule",
   "CSSMediaRule",
   "CSSNamespaceRule",